Type-writing machine.



N. H. ANDERSON.

"TYPE WRITING MACHINE. APPLICATION FILED JUNE 12, I914.

1,236,65. Patented Aug. 14, 1917.

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N. H. ANDERSON. TYPE WRITING MACHINE. APPLICATION man JUNE 12', 1914.

1,236,650. Patented Aug. 11, 1917.

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Mrs H. ANDERSON, or MIDDLETOWN, CONNECTICUT, AssIGNon to THE NoIsnLEssrvrnwnrrnn COMPANY, or MIDDLETOWN, CONNECTICUT, A CORPORATION orCONNECTICUT.

Application filed June 12, 1914.

To all whom it may concern:

Be it known that I, Nrns H. ANDERSON, a citizen of the United States,residing at Middletown, in the county of MiddleseX and State ofConnecticut, have invented certain new and useful Improvements inType-Writing Machines, of which the following is a full, clear, andexact description, such as will enable others skilled in the art towhich it appertains to make and use the same.

This invention relates to typewriting machines, and with regard tocertain more specific features thereof, to the escapement mechanism andassociated parts.

One of the objects of the present invention is to provide a simple andpractical escapement mechanism. Another object is to provide anescapement mechanism which will be efiicient and reliable in use andoperation. A further object is to provide an escapement mechanism whichmay be independently operated from the type actions or space bar. Afurther object is to provide an escapement mechanism of the firstabovementionecl character which will permit writing at a high rate ofspeed and with a minimum amount of noise. Other objects will be in partobvious and in part pointed out hereinafter.

The invention accordingly consists in the features of construction,combinations of elements and arrangement of parts which will beexemplified in the construction hereinafter set forth, and the scope ofthe application of which will be indicated in the following claims.

In the accompanying drawings, wherein is shown one of various possibleembodiments of this invention,

Figure 1 is a plan view of a portion of a typewriting machine showingthe escapement mechanism and some of the associated parts appliedthereto;

Fig. 2 is a side elevation of the same;

Fig. 3 is a detail plan view of a portion of the escapement mechanism;

Fig. l is a diagrammatic view of theparts shown in Fig. 3; and

Figs. 5 and 6 are detail views.

S m r refere ce chara e s refer to im Specification of Letters Patent.

TYPE-WRITING MACHINE.

Patented Au 14, 1917.

Serial No. 844,654.

lar parts throughout the different views of the drawings.

The present invention will be hereinafter described with relation to itsapplication to the Noiseless Typewriting Machine, although it is ofcourse to be understood that the escapement is applicable to other formsof machines without departing from the scope of the invention.

In the accompanying drawings the escapement is shown free from the othermechanisms common to a typewriting machine for the sake of clearness,and it may be stated briefly that this escapement mechanism is adaptedto be actuated at each operation of any type action or the space bar tofeedthe carriage with which it is con neeted one letter space in aletter feed direction.

Referring now in detail to these drawings, and more particularly toFigs. 1 and 2, 1 denotes an escapement shaft which is verticallydisposed in the rear of the machine, its lower end being supported intrunnions 2 carried by an escapement bracket 3 secured to the frame ofthe machine. The object in mounting the escapement shaft in trunnions inthis manner is to permit of an adjustment of the carriage fore and aftof the machine, according to the number of sheets carried thereby, inorder that the outer sheet may be properly positioned with respect tothe end of the path of travel of the type carriers. Immediately abovethe trunnions is positioned an escapement wheel 4 which is keyed to theshaft in any desired manner, as by means of a set screw This escapementwheel has an upwardly eX- tending portion or hub which is provided, nearits upper end, with a grooved portion or ring 6 adapted to support andcontrol a plurality of radially movable teeth 7. These teeth have offsetends 8 and are mounted in radially disposed grooves both in theescapement wheel and the grooved ring and are held in place by means ofa ring 9 passing around the grooved portion and engaging all of theteeth. The teeth are maintained in their normal or inactive outwardposition by means of a coil spring 10 engaging notches in their upperends and act-.

ing on the teeth in such a manner as to urge their lower ends outward ina position to be engaged by a silencing stop or do 11 mounted slightlyabove in the rear 0 the escapement wheel.

At this point it may be briefly noted that, in operation, the teeth 7are tripped successively'out of engagement with the silencing dog 11' bytripping mechanism which will be hereinafter more fully described.

When the carriage is returned to linecommencing position a reversemovement is, of course, given the escapement wheel, and the teeth,during this reverse movement, move inwardly in passing the dog, beingreturned to normal position immediately thereafter by the action of thecoil spring 10 engaging their upper ends. The dog 11, which limitsrotation of the escapement wheel, and is thus a holding dog, may also,for convenience, be called a silencing dog, for the reason that itsilently arrests the movement of the escapement wheel when feeding thecarriage in a letter space direction, and further, for the reason thatit is neither a fixed dog nor a movable dog in the sense in which theseterms are generally used in this art.

As shown more clearly in Fig. 3, this holding or silencing dog, which iscomposed of two parts, is pivotally mounted at 12 on a bracket orsupport 13 secured to the escapement bracket 3. The movement of the dogabout its pivot is controlled by the action of a bell crank lever 14pivotally mounted at 15 to one side of the dog upon the bracket 13, andhaving its long arm 16 connected at one end to the dog by means of ashort link 17. When normally engaging the teeth of the escapement wheelthe parts are substantially in the position as shown in Fig. 3, but whena tooth is tripped out of engage ment with the silencing dog the bellcrank 14 is rotated by the action of a spring 18 connected to the outerend of its short arm 20, which causes the dog 11 to pass forward aslight amount ready for engagement with the neXt succeeding tooth of theescapement wheel. It will be noted, however, that this distance is veryslight, which permits the tooth of the escapement wheel to move freelyand rapidly through a relatively large por tion of its path of travel,yet it is suflicient to silently arrest the movement of the escapementwheel by means of the peculiar toggle construction composed of the bellcrank lever 14, the connecting link 17 and the member 21 forming part ofthe dog 11. By referring to the diagram in Fig. 4-, which shows theparts in their active position, this toggle construction will be clear.The

. amount which the bell crank lever 14 is permitted to swing iscontrolled by an adjustable stop pin 22 mounted upon the bracket 13against which the short arm 20 is brought to rest under the action ofthe coil spring 18. The tension of this spring may also be controlled byan adjustable automatic lock nut 23 engaging a threaded member 2 1 towhich the spring 18 is connected after passing through an ear 25 on thebracket supporting the silencing dog.

It will be noted that the dog itself is a separate and independentmember mounted in slots at the end of the link 21, pivoted at itsopposite end 12 to the bracket. This construction permits the dog 11 tobe moved rearward when the lug 26 is engaged by a member 27 connectedwith the tabulating mechanism to allow the escapement wheel to run free.The dog is normally held in outward position by an. expansion spring 28,as shown in Fig. 5. v

The tripping mechanism is shown more clearly in Figs. 1 and 2 andcomprises a bracket 30 attached to the frame of the machine and carryingtwo pawls, one of which, 31, is adapted to trip the escapement from thekey action through the universal bar mechanism, and the other, 32,.totrip the escapement from the space bar mechanism. The pawl 32 is mountedat the upper end of an arm 33 carried by a shaft 34 adjustablytrunnioned in the bracket 30, while the pawl 31 is carried by a similararm 35 on a shaft 36 also pivotally mounted on the bracket 30. The pawl31 is shown in detail in Fig. 6 in retracted position, and, it will benoted, is held in normal raised positionby means of the coil spring 37connecting its rear end with a lug 38 on the lower end of the arm 35 onwhich it is mounted. This spring, however, is sufliciently resilient topermit the pawl to be easily moved into inactive position beforetripping the-escapement tooth,

or when moving to position shown in Fig. 6.

The pawl 31 is connected to the universal bar mechanism by means of anarm 40 mounted on the outer end of the shaft 36, through whichconnection is made to a universal bar rock shaft 41 by means of anadjustable pull wire 42 and an arm 43 keyed to the shaft. When theuniversal bar is actuated the shaft 11 rotates in the directionindicated by the arrow and causes the pawl 31- to pass under the toothof the escapement wheel, and on its return movement to normal positiondisengages the tooth 7 from the silencing dog 11, allowing the wheel torotate to bring the next tooth into position. The pawl and associatedparts are returned to normal position by means of a universal bar spring4 1 connected to an arm 415 011 shaft 36. It will be noted that the pawl31 normally stands in front of the tooth of the escapement wheel andslightly to one side thereof, as shown clearly in Fig. 1, and whenactuated passes behind the tooth and then forward again to engage theoffset end 8 of the tooth and move the teeth i a d fir the silencingdog. This peculiar action is especially desirable in a universal barmechanism, in which the movement which actuates the escapement is madeafter the key lever has been brought to rest and the escapement trippedindependently of the holding down of the key lever by the operator, asis done in the Noiseless machine. In other words, it is particularlyapplicable to an escapement mechanism which is. tripped simultaneouslywith or efiectively after the printing moment.

The space bar mechanism trips the escapement by means of the pawl 32 andits operation is substantially the reverse to that above described inconnection with the pawl 31. That is, the pawl 32 occupies a normalposition immediately behind the tooth 7 of the escapement wheel and actsthereon to disengage the tooth from the silencing dog 11 during thedownward movement of a space bar 46, which operates to rotate the rockshaft 3st and arm 33 toward the front of the machine through the spacebar rock shaft 17, pull wire 48 and arm 50 on shaft 341, the parts beingreturned by spring 51 on rock shaft 47. Under this condition the pawlwill trip the tooth 7 out of engagement with the silencing dog 11 andpermit the next succeeding tooth of the escapement wheel to move intoengagement therewith. The pawl returns to its normal position after saidoperation has taken place. Should this return movement of the-dog occurunder abnormal conditions, as while the escapement wheel is rotating, itis desirable to offset the lower end of each tooth of the escapementwheel whereby it will be engaged by the pawl, since this will allow acorrect return movement of the pawl without interference. A spring 52similar to sprin 37 permits such movement and assures a proper returnand holding in normal position.

It will thus be seen that, in this particular form of escapementmechanism, separately and independently acting means having effectivemovements in opposite directions are provided for tripping theescapement according to whether the space bar is actuated or one of thetype actions. The actuating pawls, being pivotally mounted andresiliently held in normal position, are permitted to return to suchposition after each actuation in a rapid and silent manner.

It is thought that the operation of this device will be clear from theabove description. It may, however, be briefly stated as follows:Assuming the parts to be in position as shown in Figs. 1 and 2, whenevera type action is operated it will, in a Noiseless machine, operate theuniversal bar rock shaft 41 at substantially the end of the path oftravel of the type carrier. Motion is transmitted from the shaft throughthe arm and adjustable pull wire 4:2 to the rock shaft 36 carrying thetripping pawl 31. This pawl moves first rearward and on its returnengages the adjacent tooth 7 of the escapement wheel and moves its lowerend inward out of the path of travel of the silencing dog 11 before itslips out of engagement therewith. As soon, however, as the tooth of theescapement wheel is tripped, the parts of the silencing dog will moveinto the position shown diagrammatically in Fig. 1; that is, flexing thetoggle construction shown. The escapement wheel is rotated under theaction of the spring drum drive mechanism common to many forms ofcommercial machines and causes the succeeding tooth of the escapementwheel to move into contact with the silencing dog. As it moves intoengagement it will carry the same back to normal position, as shown inFig. 3, and move the toggles comprising the silencing mechanism intoextended or straightened position, at the same time tensioning theactuating spring 18. This movement will, of course, silently arrest themovement of the escapement wheel, but as the distance through which thetooth of the escapement wheel travels after coacting with the silencingdog is so very slight, there will not be a perceptible retardation ofthe effective operation of the escapement mechanism.

When the space bar mechanism is actuated, motion is transmitted throughthe space bar rock shaft 17 the arm mounted thereon and adjustable pullwire 48 to the other pawl 32, which operates to trip the teeth of theescapement wheel directly or in a manner reverse to that of the trippingpawl. The general result, however, is the same in both cases, for theescapement wheel is permitted to rotate one letter space movement ateach tripping.

It is thus seen that this invention provides a simple and practicalescapement mechanism which is eflicient and reliable in operation and inuse and is believed to accomplish, among others, all of the objects andadvantages above set forth.

As many changes could be made in the above construction and manyapparently widely different embodiments of this invention could be madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense.

Having described my invention, what I claim as new and desire to secureby Letters Patent is:

1. In escapement mechanism, in combination, an escapement rack, andmeans to effect a step-by-step feed thereof and to silently arrest thesame during the final portion of each feed step whereby the initialportion of each feed step is free. said means including a movableholding dog positioned for engagement by a tooth of said rack at a pointclosely adjacent the termination of a feed step movement of the latter.

2. In escapement mechanism, in combination, a rotatable escapementwheel, and means to effect a step-by-step rotative feed thereof and tosilently arrest the same dur ing a relatively short final portion ofeach feed step whereby the rotative movement thereof is unrestrictedduring a relatively long initial portion of each feed step, said meansincluding a movable holding dog positioned for engagement by a tooth ofsaid 'ack at a point closely adjacent the termination of a feed stepmovement of the latter.

. 3. In escapement mechanism, in combination, an escapement wheel havingrelatively movable teeth, and common means normally urging all of saidteeth to normal position.

4:. In escapement mechanism, in combination, a rotatable escapementwheel, a plurality of teeth pivoted thereon and having their freeextremities movable radially with respect thereto, and a common springacting upon all of said teeth and urging the eX tremities thereofoutward.

5. In escapement mechanism, in combination, an escapement wheel havingradially disposed teeth, resilient means holding said teeth in normaloutward position, means to move said teeth inward, and a movable holdingdog to coact with the teeth of the escapement wheel.

6. In escapement mechanism, in combination, an escapement wheel havingradially disposed teeth, resilient means holding said teeth in normaloutward position, means to move said teeth inward, a movable holdingdog, and means associated with said dog to silently arrest its movementand the move ment of the escapement wheel.

7. In escapement mechanism, in combination, a rotatable escapement wheelhaving an elongated hub, a plurality of elongated teeth pivotallymounted on said hub and disposed substantially in the direction thereof,the free ends of said teeth being movable radially toward the center ofsaid wheel, a dog holding said escapement wheel in normal position, andmeans to trip said teeth.

8. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog for retaining the wheel in normal position,a tripping dog, and a toggle mechanism associated with the holding dogfor silently arresting its movement and the movement of the escapementwheel.

9. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog, a tripping dog, and a toggle associatedwith said holdmg dog adapted to be flexed after the escapement wheel istripped.

10. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog coacting therewith, means for tripping theescapement teeth, and a toggle mechanism associated with the movableholding dog.

11. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog coacting therewith, means for tripping theescapement teeth, and a toggle mechanism associated with the holding dogadapted to move to flexed position after the teeth of the escapementwheel have been tripped.

12. In an escapement mechanism, in combination, an escapement wheelhaving movable teeth, a holding dog coacting therewith, means fortripping the escapement wheel, toggle mechanism associated with theholding dog and movable to flexed position after the teeth of theescapement wheel have been tripped, and resilient means associated withsaid toggle mechanism for silently arresting its return to normalposition.

13. In escapement mechanism, in combination, an escapement bracket, anescapement wheel trunnioned therein, a plurality of radially disposedteeth mounted in the escapement wheel, a holding dog, and a trip pingdog.

14. In escapement mechanism, in combination, an escapement bracket, anescapement wheel trunnioned therein, a plurality of radially disposedteeth mounted in the escapement wheel, asilencing dog, and a pair oftripping dogs one of which is adapted to trip the teeth of the,escapement wheel on its forward movement and the other on its returnmovement. 7 e

15. In escapement mechanism, in combination, an escapement bracket, anescapement wheel trunnioned therein, a plurality of radially disposedteeth mounted in the escapement wheel, a silencing dog, and a pair oftripping dogs one of which is con nectedwith the universal bar and theother of which is connected with the space bar mechanism.

16. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog, and a tripping mechanism, said trippingmechanism comprising a pair of movable dogs, one of which is adapted toact on its forward fmovement and the other on its return movement.

17. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog, and a tripping 1nechanism,'said trippingmechanism comprising a pair of resiliently held tripping dogs, one ofwhich .is connected. with the universal bar mechanism. and the otherwith the space bar mechanism.

18. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog, and a tripping mechanism, said trippingmechanism comprising a pair of movable dogs having their effectivemovements in opposite directions.

19. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog, and a tripping mechanism, said trippingmechanism comprising a pair of vertically disposed movable dogs andspring means holding said dogs in normal position and permitting them tomove out of the path of travel of the teeth of the escapement wheel.

20. In escapement mechanism, in combination, an escapement Wheel havingmovable teeth, a holding dog, and a tripping mechanism, said trippingmechanism comprising a bracket, independent shafts mounted in saidbracket and tripping dogs mounted on said shafts.

21. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog, and a tripping mechanism, said trippingmechanism com prising a bracket, independent shafts mounted in saidbracket and tripping dogs mounted on said shafts, one of said dogs beingadjnstably connected with the universal bar mechanism and the other ofsaid dogs being connected with the space bar mechanism.

22. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, a holding dog, and a tripping mechanism, said trippingmechanism com prising a bracket, independent shafts mounted in saidbracket and tripping dogs mounted on said shafts, one of said dogs beingadjustably connected with the universal bar mechanism and the other ofsaid dogs being connected with the space bar mechanism and having theireffective movements in opposite directions.

23. In escapement mechanism, in combination, an escapement wheel havingsubstantially radially movable teeth, a movable holding dog coactingtherewith, and a trip ping means associated with said parts, saidmovable holding dog having an independent fore and aft movement topermit a free rotation of the escapement wheel.

24. In escapement mechanism, in combination, an escapement wheel havingsubstantially radially movable teeth, a movable holding dog coactingtherewith, and a tripping means associated with said parts, said movableholding dog being pivoted at its rear end and a toggle associatedtherewith to limit its return movement.

25. In escapement mechanism, in combination, an escapement wheel, aholding dog coacting therewith, and a reverse toggle associated withsaid holding dog adapted to limit and to silently arrest the movement ofthe escapement wheel.

26. In escapement mechanism, in combination, an escapement wheel, and amovable dog associated there *ith for silently arresting the movement ofthe escapement wheel, and a toggle to limit and silently arrest movementof the escapement wheel, said toggle comprising a bell crank lever, aspring connected with one arm and a link connecting the other arm withthe movable dog.

27. In escapement mechanism, in combination, an escapement wheel, and amovable dog associated therewith for silently arresting the movement ofthe escapement wheel, and a toggle to limit and silently arrest movementof the escapement wheel, said toggle comprising a bell crank lever, aspring connected with one arm and a link connecting the other arm withthe movable dog, one arm of said bell crank lever and said link forminga reversed toggle.

28. In escapement mechanism, in combination, an escapement wheel,movable teeth, tripping means, a holding dog to move forward after theescapement wheel is tripped for engagement by the next tooth, a bellcrank lever, and a spring connected with said holding dog adapted tobring the parts to rest without impact or concussion.

29. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, tripping mechanism, and holding mechanism, said holdingmechanism comprising a pivotally mounted dog having an independent foreand aft movement.

30. In escapement mechanism, in combination, an escapement wheel. havingmovable teeth, tripping mechanism, and holding mechanism, said holdingmechanism comprising a twopart pivotally mounted dog, a bell crank leverand a link between one arm of said bell crank lever and one of the partsof said dog.

31. In escapement mechanism, in combination, an escapement wheel havingmovable teeth, tripping mechanism, and holding mechanism, said holdingmechanism com' prising a pivotally mounted dog and a bell crank levertoggle mechanism associated therewith to move the dog forward after thetripping mechanism has been operated.

32. In escapement mechanism, in combination, an escapement bracket, anescapement wheel mounted therein having substantially radially movableteeth, a movable holding dog, and tripping mechanism comprising a pairof resiliently held tripping pawls connected with the space bar anduniversal bar mechanism, respectively, said holding dog having meansassociated therewith to urge it silently forward after the escapementwheel has been tripped.

38. In escapement mechanism, in combination, an escapement bracket, anescapement wheel mounted therein having substantially radially movableteeth, a movable NILS H. ANDERSON.

holding dog, and tripping mechanism comprising a, pair of resilientlyheld tripping pawls connected with the space bar and universal barmechanisms, respectively, said holding dog having means associatedtherewith to urge it silently forward after the escapement wheel hasbeen tripped, and a reversed toggle bell crank mechanism for Witnesses:

FRANCIS A. BEACH, EDWARD A. WILCOX.

Copies of this patent may be obtained for five, cents each, byaddressing the Commissioner of Patents, Washington, D. 0.

